package com.ecar.common.util;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

public class SpringContextUtil implements ApplicationContextAware{
	
	
	private static ApplicationContext applicationContext;     //Spring应用上下文环境
	
	
	/** 
	  * 实现ApplicationContextAware接口的回调方法，设置上下文环境    
	  * @param applicationContext 
	  * @throws BeansException 
	  */  
	  public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {  
	    SpringContextUtil.applicationContext = applicationContext;  
	  }  
	   
	  /** 
	  * @return ApplicationContext 
	  */  
	  public static ApplicationContext getApplicationContext() {  
	    return applicationContext;  
	  }  
	   
	  /** 
	  * 获取对象    
	  * @param name 
	  * @return Object 一个以所给名字注册的bean的实例 
	  * @throws BeansException 
	  */  
	  public static Object getBean(String name) throws BeansException {  
	    return applicationContext.getBean(name);  
	  }  
	   
	   
	  /** 
	  * 如果BeanFactory包含一个与所给名称匹配的bean定义，则返回true  
	  * @param name 
	  * @return boolean 
	  */  
	  public static boolean containsBean(String name) {  
	    return applicationContext.containsBean(name);  
	  }  
	   
	  /** 
	  * 判断以给定名字注册的bean定义是一个singleton还是一个prototype。 
	  * 如果与给定名字相应的bean定义没有被找到，将会抛出一个异常（NoSuchBeanDefinitionException）    
	  * @param name 
	  * @return boolean 
	  * @throws NoSuchBeanDefinitionException 
	  */  
	  public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {  
	    return applicationContext.isSingleton(name);  
	  }  
	   
	   
	  /** 
	  * 如果给定的bean名字在bean定义中有别名，则返回这些别名    
	  * @param name 
	  * @return 
	  * @throws NoSuchBeanDefinitionException 
	  */  
	  public static String[] getAliases(String name) throws NoSuchBeanDefinitionException {  
	    return applicationContext.getAliases(name);  
	  }  
}
